benghazi is where the four americans were killed. >> reporter: there are important divisions between the united states and libya on the investigation of what exactly happened at the consulate and the safe house that night. the u.n. ambassador susan rice said it appears that the attacks were not premeditated. but that's not what we're hearing here. the president of the libyan national council said not only does it look like they were premeditated, but it may have taken months in the planning. what i can tell you is we saw plenty of evidence of heavy weapons at this safe house. mortars and other kinds of weapons that take a level of expertise to deploy that accurately. we've also seen new cell phone footage of what appears to be libyans removing the body of ambassador christopher stevens from the consulate that night. they don't seem to know who he is. they identify him as a foreigner. they believe that he is alive at the time. they're shouting out whether anybody knows first aid. and the young man who showed us that video says that ambassador stevens was then rushed to the hospital wh